Evan Ward created MATH-949:
------------------------------
Summary: LevenbergMarquardtOptimizer reports 0 iterations
Key: MATH-949
URL: https://issues.apache.org/jira/browse/MATH-949
Project: Commons Math
Issue Type: Bug
Affects Versions: 3.2
Reporter: Evan Ward
The method LevenbergMarquardtOptimizer.getIterations() does not report the
correct number of iterations; It always returns 0. A quick look at the code
shows that only SimplexOptimizer calls BaseOptimizer.incrementEvaluationsCount()
I've put a test case below. Notice how the evaluations count is correctly
incremented, but the iterations count is not.
{noformat}
@Test
public void testGetIterations() {
// setup
LevenbergMarquardtOptimizer otim = new LevenbergMarquardtOptimizer();
// action
otim.optimize(new MaxEval(100), new Target(new double[] { 1 }),
new Weight(new double[] { 1 }), new InitialGuess(
new double[] { 3 }), new ModelFunction(
new MultivariateVectorFunction() {
@Override
public double[] value(double[] point)
throws IllegalArgumentException {
return new double[] { FastMath.pow(point[0], 4)
};
}
}), new ModelFunctionJacobian(
new MultivariateMatrixFunction() {
@Override
public double[][] value(double[] point)
throws IllegalArgumentException {
return new double[][] { { 0.25 * FastMath.pow(
point[0], 3) } };
}
}));
// verify
assertThat(otim.getEvaluations(), greaterThan(1));
assertThat(otim.getIterations(), greaterThan(1));
}
{noformat}
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